1 Department of Gastrointestinal Medicine and Surgery, Guy's and St Thomas' NHS Foundation Trust, London, UK; School of Sport and Exercise Science, Faculty of Science, Liverpool John Moore's University, Liverpool, UK.
2 Virginia Mason Medical Centre, Seattle, USA.
3 School of Sport and Exercise Science, Faculty of Science, Liverpool John Moore's University, Liverpool, UK; Research Institute for Sport & Exercise Science, Liverpool John Moore's University, UK.
4 Department of Gastrointestinal Medicine and Surgery, Guy's and St Thomas' NHS Foundation Trust, London, UK; Division of Cancer Studies, King's College London, UK. Electronic address: [email protected].